The Younger star and her boyfriend, Jason Walsh, caused controversy on Friday when they showed up to the Casamigos Tequila Halloween Party in Beverly Hills, California, dressed as a pilgrim and Native American, respectively.

Photo: Getty Images for Casamigos Tequila

"I am SO sorry to people I offended with my costume," the 29-year-old actress tweeted. "It was not properly thought through and I am truly, from the bottom of my ❤️sorry."

Walsh also shared an apology, posting a photo on Instagram that read, "I meant no disrespect. I only have admiration for the indigenous people of America. In hindsight I would not have made that decision. I apologize to anyone I may have offended."